Thanks for the advice

That's wierd though, I just got the impression becuase it says the device name is Nvidia Riva TNT in dxdiag. Here what the log for my display device says:
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Display Devices
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Card name: NVidia Riva TNT
Manufacturer: NVidia
Chip type: NV4
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0020&SUBSYS_00201545&REV_04
Display Memory: 16.0 MB
Current Mode: 800 x 600 (16 bit) (60Hz)
Monitor: Gateway EV700
Monitor Max Res: 1280,1024
Driver Name: nv4.dll
Driver Version: 5.00.2160.0327 (English)
DDI Version: unknown
Driver Attributes: Final Retail
Driver Date/Size: 12/7/1999 08:43:38, 530192 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: nv4.sys
Mini VDD Date: 10/27/1999 07:23:38, 345040 bytes
Device Identifier: {D7B71E3E-4360-11CF-B277-5028ABC2C835}
Vendor ID: 0x10DE
Device ID: 0x0020
SubSys ID: 0x00201545
Revision ID: 0x0004
Revision ID: 0x0004
Video Accel:
Deinterlace Caps: n/a
Registry: OK
DDraw Status: Enabled
D3D Status: Not Available
AGP Status: Not Available
DDraw Test Result: Not run
D3D7 Test Result: Not run
D3D8 Test Result: Not run
D3D9 Test Result: Not run